#define _CRT_SECURE_NO_WARNINGS 1

#include"Date.h"


Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}


Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

Date& Date::operator=(const Date& d)
{
	if (*this != d)
	{
		_year = d._year;
		_month = d._month;
		_day = d._day;
	}
	return *this;
}

bool Date::operator>(const Date& d)
{
	if (_year > d._year)
	{
		return true;
	}
	else if (_year == d._year)
	{
		if (_month > d._month)
		{
			return true;
		}
		else if (_month = d._month)
		{
			if (_day > d._day)
			{
				return true;
			}
		}
	}
	return false;
}

bool Date::operator==(const Date& d)
{
	if (_year == d._year)
	{
		if (_month == d._month)
		{
			if (_day == d._day)
			{
				return true;
			}
		}
	}
	return false;
}


bool Date::operator>=(const Date& d)
{
	if (*this > d || *this == d)
	{
		return true;
	}
	return false;
}

bool Date::operator<(const Date& d)
{
	if (*this >= d)
	{
		return false;
	}
	return true;
}

bool Date::operator<=(const Date& d)
{
	if (*this > d)
	{
		return false;
	}
	return true;
}


Date& Date::operator+=(int i)
{
	_day += i;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month > 12)
		{
			++_year;
			_month = 1;
		}
	}
	return *this;
}


Date Date::operator+(int i)
{
	Date tmp = *this;
	tmp += i;
	return tmp;
}

Date& Date::operator-=(int i)
{
	_day -= i;
	while (_day <= 0)
	{
		_day += GetMonthDay(_year, --_month);
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}
	}
	return *this;
}

Date Date::operator-(int i)
{
	Date tmp = *this;
	tmp -= i;
	return tmp;
}

bool Date::operator != (const Date& d)
{
	if (*this == d)
	{
		return false;
	}
	return true;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date tmp = *this;
	*this += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp = *this;
	*this -= 1;
	return tmp;
}

int Date::operator-(const Date& d)
{
	int flag = 1;
	int n = 0;
	Date d1 = *this;
	Date d2 = d;
	if (*this < d)
	{
		Date d2 = *this;
		Date d1 = d;
		flag = -1;
	}
	while (d1 != d2)
	{
		++d2;
		n++;
	}
	return n * flag;
}

//void print(Date& d)
//{
//	cout << d._year << ' ' << d._month << ' ' << d._day << endl;
//}